package com.pptree.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class LoginCheckFilter
 */
@WebFilter("/download/*")
public class LoginCheckFilter implements Filter {

	/**
	 * Default constructor.
	 */
	public LoginCheckFilter() {
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		// TODO Auto-generated method stub
		// place your code here
		HttpServletRequest req = (HttpServletRequest) request;
		HttpServletResponse res = (HttpServletResponse) response;
		HttpSession session = req.getSession();
		String requestUri = req.getRequestURI();
		System.out.println("请求" + requestUri + "，进入LoginCheckFilter");
		if (session != null && session.getAttribute("user") != null) {
			// pass the request along the filter chain
			chain.doFilter(request, response);
			return;
		} else {
			String contextPath = req.getContextPath(); // /news
			res.sendRedirect(contextPath + "/" + "401.html");
		}
		System.out.println("请求" + requestUri + "，退出LoginCheckFilter");

	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
